CA1159580A - Device for forming layer images of a three- dimensional object by means of superposition zonograms - Google Patents
Device for forming layer images of a three- dimensional object by means of superposition zonogramsInfo
- Publication number
- CA1159580A CA1159580A CA000371281A CA371281A CA1159580A CA 1159580 A CA1159580 A CA 1159580A CA 000371281 A CA000371281 A CA 000371281A CA 371281 A CA371281 A CA 371281A CA 1159580 A CA1159580 A CA 1159580A
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- 230000005855 radiation Effects 0.000 claims abstract description 58
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 238000003384 imaging method Methods 0.000 claims abstract description 4
- 230000000875 corresponding effect Effects 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003325 tomography Methods 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/025—Tomosynthesis
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- Engineering & Computer Science (AREA)
- Radiology & Medical Imaging (AREA)
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- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Radiography Using Non-Light Waves (AREA)
Abstract
PHD 80020 10 10.10.80 ABSTRACT:
Device for forming layer images of a -three-dimensional object by means of superposition zonograms.
The invention relates -to a device for the layer-wise imaging of a three-dimensional object, comprising a group of radiation sources which are situated in a common radiation source plane in order to irradiate an object ar-ranged on an examination table, and also comprising a re-cord carrier situated underneath the object for recording a source-distribution encoded image of the object which consists of respective perspective images. The radiation source group and the record carrier are arranged to slide in opposite directions in parallel planes relative to the stationary object during a radiographic recording. The res-pective connecting lines between each time one of the ra-diation sources and the centre of the record carrier, each pass through a corresponding fixed point of the object for all positions of the radiation source group.
Device for forming layer images of a -three-dimensional object by means of superposition zonograms.
The invention relates -to a device for the layer-wise imaging of a three-dimensional object, comprising a group of radiation sources which are situated in a common radiation source plane in order to irradiate an object ar-ranged on an examination table, and also comprising a re-cord carrier situated underneath the object for recording a source-distribution encoded image of the object which consists of respective perspective images. The radiation source group and the record carrier are arranged to slide in opposite directions in parallel planes relative to the stationary object during a radiographic recording. The res-pective connecting lines between each time one of the ra-diation sources and the centre of the record carrier, each pass through a corresponding fixed point of the object for all positions of the radiation source group.
Description
~ss~a The invention relates to a device for the layer-wise imaging of a three dimensional object, lncluding radiation source means arranged to irradiate an object under examination with penetrating radiation from each of a plurality of source positions which are distributed in a common radiation source plane, an examination table on which said object is arranged, and a record carrier which is situated underneath the object to record a source dis-tribution encoded composite image of the object which con-sists of a corresponding plurality of respective perspec-tive images which can overlap one another.
A device of this kind is already known from German Offenlegungsschrifk 26 05 497 with a date of August 18, 1977 and which is assigned to Philips Patentverwaltung lS GmbH. Therein, an object is irradiated from different per-spective directions by means of a multiple radiation source which consists of several separate radiation sources which are situated in one plane/ a source dis~ribution encoded composite image of the object being recorded on a record carrier which is arranged underneath the object. The com-posite image can subsequently be decoded in order to form layer images of the object, for example, by means of the decoding method described in German Offenlegungsschrift 24 14 322 with a date of October 9, 1975 and which is assigned to Philips Patentverwaltung GmbH.
However, the formation of the encoded images by means of this device has a drawback in that the super-posed imaging of central projections from different pers-pectives causes superposition artefacts in the decoded image due to object structures, for example, bones, which are not situated in the region of interest in the selected sectional layer of the object so that the quality of a de-coded sectional layer image is reduced. It i5 also a draw-back that all superposed central projections are imaged with a comparatively large contrast range, so that in the ,.,i. , . .
-1 159~
PHD 80020 2 10.10.80 ~ilm r0gion which is already strongly exposed by a central projection object in~ormation is lost which is projected on the same area from other perspectives. The contrast range of a layer image or zonogram is essentially smaller than that o~ a central projection.
There~ore, the invention hàs ~or its object to provide a device for ~orming layer images by means o~
which arte~acts in the decoded layer image which are caus-ed by object details situated outside -the reconstructed object layer are reduced.
The object in accordance with the invention is achieved in that the radiation source group and the record carrier are arranged to slide in opposite directions in mutually parallel planes relative to the stationary object during a radiographic exposure so that a respective notional straight line connecting any said radiation source position to the centre o~ the record car-rier, will pass through a corresponding fixed point in a common plane through the object ~or all posi-tions o~ the radiation source means.
The object in accordance with the invention can alternatively be achieved by moving the object and the re~
cord carrier in the same direction with respect to the stationary radiation sourca means during a radiographic exposure in planes parallel to the radiations source plane so that a respective notional straight line connecting an~
said radiation source position to the centre o~ the record carrier, will pass through a corresponding point ~ixed re-lative to and in a common plane through the object ~or all positions of the object.
Thus, during the recording o~ a source-distribu-tion encoded composite image by means o~ a device in ac-cordance with the invention, only a predetermined ~ono-graphic region, ~or example, a sectional layer region hav-ing a thickness o~ ~:rom a few millimeters to a ~ew centi-meters, o~ the irradiated object will be sharply imaged, while all object details situated ou-tside t]lis sectional ~ 1~958~
PHD 80020 3 10.10.80 layer region will be recorded in a blurred manner. The formation of artefacts in the decoded image due to object structures situated outside the r0levant object layer will thus be greatly reducedO Any one of a plurality of spaced layer i~lages of the object located in a sharply imaged layer region can then be decoded rrom the composite image relating to that region by means of the lcnown decoding method.
The image contrast of the decoded layer will be good because object details which are situated outside the object layer will already have 'been blurred during the zonographic exposure, and they will have but little erfect on the formation of the layer image during the decoding process. In principle, two blurring operations are carried out on object details which do not belong to the selected object layer: the first blurring operation is carried out during the zonographic recording exposure, and the second blurring operation is carried out during the decoding pro-cess. The contrast is thus enhanced.
The recording of superposed ~onograms offers further advantages in that : 1. the film is not unnecessa-rily blackened by object structures which are not situated in the region Or interest, and 2. ~or the actual object in-formation, use can be made of a film having a smaller con-' trast range.
In a preferred embodiment in accordance with the invention, the record carrier is formed by a multiple-~' film cassette for simultaneously recording a plurality of layer regions of the object which are situated one be-neath the other, so that several layer regions o~ the ob-ject can be made available for decoding as a res'ult of on-ly one recording operation.
A device in accordance with the invention can be used, for example~ for 'bone tomography. The device can al-so be used advantageously for selec-tive layer examinatio~, for example, Or the auditory canals, the orbits or the vertebral column, ~ _ objects where -the dimension of 'depth can be covered with rew adjacently arranged ~ono-~l~ss~a graphic ob~ect ranges.
The drawing shows an embodiment în accordancewith the invention.
Figure 1 illustrates the layer thickness in the case of a zonogram, Figure 2 shows a tomography apparatus in accor~
dance with the invention, for forming zonographic layer images, and Figure 3 shows a tomography apparatus in accor-dance with the invention, which comprises a multiple filmcassette for the simultaneous formation of a plurality of zonographic layer images.
Figure 1 is a sketch illustrating the layer thick-ness relating to a zonogram. The layer thickness S is dependent on the layer angle ~ between two lines a, _ which denote, for example, the central rays of the radiation beam of a displaceable radiation source, and the permissible overall unsharpness U which can be allowed for the relevant field of application. All object details which are present within the shaded zone B during the recording of the zono-gram will be sharply imaged. The sharpness of the image will depend on the total unsharpness U which results from the layer angle ~ and the layer thickness S. All object structures which are situated above and below the shaded zone B will be imaged with a greater degree of unsharpness, in other words in a blurred manner, with the result that artefacts caused by such object structures will be substan-tially reduced.
Figure 2 shows a tomography apparatusin accordance with the invention, for forming zonographic layer images, comprising a source assembly formed by a plurality of radi-ation sources 2 which are distributed in a common radiation source plane 1 according to a predetermined point distribu-tion (see, for example, German Offenlegungsschrift 28 30 186 witha date of Jan. 2~, 1980 and which is assigned to Philips Patentverwaltung GmbH). The number of radiation sources (X-ray tubes) may be, for example, 15 or more, even though for the sake of clarity, Figure 2 shows only three radiation ~ ~ 5~5~
PHD 80020 5 10.10.80 sources. It should be noted that, as an alternative, a single radiation source can be located in succession at the various source positions for irradiating the objec-t.
Underneath -the radiation sources 2, an object 4 is arranged on an examination table 3 and is irra-diated by the distribution of radiation sources 2 so that the corresponding perspective images of the object 4 are in superposition as a source-dis-tribution encoded compo-site image 6 on a record carrier 5, for example, an X-ray film, which is arranged underneath the object 4. The direo- -tion in which the radiation sources 2 irradiate the ob-ject 4 may extend, for example, according -to a line 7 which extends perpendicularly through the zone B of the object L~, the radiation source plane 1 and the flat record carrier 5 also being situated perpendicularly to said line 7. The assembly of radiation sources 2, which are housed, for example, in a common tank in order to form a multiple radiation source, and the record carrier 5, are arranged respectively to be slidable in their relevant plane. In order to form a zonographic image of the object 4 during a radiographic exposure, the radiation sources 2 and the record carrier 5 are displaced, while maintaining their mutual distance, in opposite directions 8, 9 along, for example, their centres respectively straight pa-ths sub-tending the same angle ~ at the object 4 with respect to the first irradiation direction 7, so that the object 4 is irradiated in a further irradiation direction 7l~ the point of intersection of the irradiation directions 7, 7~ -being situated inside the object zone B. Thus, the respec-tive sliding is effectecl so that a respective notional straight line connecting any radiation source to the cen-tre of the record carrier 5 will always pass through a corresponding fixed point (object point) in a common plane (X, Y) through the object 4, for all positions of the radia-tion source assembly relative to the stationary object. In carrying out this, the individual radiation sources 2 at their respec-tive ~ocations in the source as-1 :~5~5~
P~D 80020 6 10.10.80 sembly, are tilted so -that their radiation beams are al-ways directed at the object ~. The radiation sources 2 can be continuowsly activated along their blurring path or can be briefly energized atsuccessive positions therealong.
It will be apparen-t that instead of the sliding of the radiation source group 2 and the record carrier 5, the object 4 and the record carrier 5 can be ~lid in the same direction as described above, parallel to the statio-nary radiation source assembly 2. The individual radiation -10 beams then remain directed on-to the object.
A ~urther possibility of forming zonographic images in a device in accordance with the invention com-prises displacing the radiation source group 2 and the record carrier 5 in their parallel planes along corres-lS ponding circular paths in opposite directions; ~or exam-ple, the line 7 which extends perpendlcularly to the layer plane B would then pass through the centres of said cir-cular paths, the centres of the radiation source assembly
A device of this kind is already known from German Offenlegungsschrifk 26 05 497 with a date of August 18, 1977 and which is assigned to Philips Patentverwaltung lS GmbH. Therein, an object is irradiated from different per-spective directions by means of a multiple radiation source which consists of several separate radiation sources which are situated in one plane/ a source dis~ribution encoded composite image of the object being recorded on a record carrier which is arranged underneath the object. The com-posite image can subsequently be decoded in order to form layer images of the object, for example, by means of the decoding method described in German Offenlegungsschrift 24 14 322 with a date of October 9, 1975 and which is assigned to Philips Patentverwaltung GmbH.
However, the formation of the encoded images by means of this device has a drawback in that the super-posed imaging of central projections from different pers-pectives causes superposition artefacts in the decoded image due to object structures, for example, bones, which are not situated in the region of interest in the selected sectional layer of the object so that the quality of a de-coded sectional layer image is reduced. It i5 also a draw-back that all superposed central projections are imaged with a comparatively large contrast range, so that in the ,.,i. , . .
-1 159~
PHD 80020 2 10.10.80 ~ilm r0gion which is already strongly exposed by a central projection object in~ormation is lost which is projected on the same area from other perspectives. The contrast range of a layer image or zonogram is essentially smaller than that o~ a central projection.
There~ore, the invention hàs ~or its object to provide a device for ~orming layer images by means o~
which arte~acts in the decoded layer image which are caus-ed by object details situated outside -the reconstructed object layer are reduced.
The object in accordance with the invention is achieved in that the radiation source group and the record carrier are arranged to slide in opposite directions in mutually parallel planes relative to the stationary object during a radiographic exposure so that a respective notional straight line connecting any said radiation source position to the centre o~ the record car-rier, will pass through a corresponding fixed point in a common plane through the object ~or all posi-tions o~ the radiation source means.
The object in accordance with the invention can alternatively be achieved by moving the object and the re~
cord carrier in the same direction with respect to the stationary radiation sourca means during a radiographic exposure in planes parallel to the radiations source plane so that a respective notional straight line connecting an~
said radiation source position to the centre o~ the record carrier, will pass through a corresponding point ~ixed re-lative to and in a common plane through the object ~or all positions of the object.
Thus, during the recording o~ a source-distribu-tion encoded composite image by means o~ a device in ac-cordance with the invention, only a predetermined ~ono-graphic region, ~or example, a sectional layer region hav-ing a thickness o~ ~:rom a few millimeters to a ~ew centi-meters, o~ the irradiated object will be sharply imaged, while all object details situated ou-tside t]lis sectional ~ 1~958~
PHD 80020 3 10.10.80 layer region will be recorded in a blurred manner. The formation of artefacts in the decoded image due to object structures situated outside the r0levant object layer will thus be greatly reducedO Any one of a plurality of spaced layer i~lages of the object located in a sharply imaged layer region can then be decoded rrom the composite image relating to that region by means of the lcnown decoding method.
The image contrast of the decoded layer will be good because object details which are situated outside the object layer will already have 'been blurred during the zonographic exposure, and they will have but little erfect on the formation of the layer image during the decoding process. In principle, two blurring operations are carried out on object details which do not belong to the selected object layer: the first blurring operation is carried out during the zonographic recording exposure, and the second blurring operation is carried out during the decoding pro-cess. The contrast is thus enhanced.
The recording of superposed ~onograms offers further advantages in that : 1. the film is not unnecessa-rily blackened by object structures which are not situated in the region Or interest, and 2. ~or the actual object in-formation, use can be made of a film having a smaller con-' trast range.
In a preferred embodiment in accordance with the invention, the record carrier is formed by a multiple-~' film cassette for simultaneously recording a plurality of layer regions of the object which are situated one be-neath the other, so that several layer regions o~ the ob-ject can be made available for decoding as a res'ult of on-ly one recording operation.
A device in accordance with the invention can be used, for example~ for 'bone tomography. The device can al-so be used advantageously for selec-tive layer examinatio~, for example, Or the auditory canals, the orbits or the vertebral column, ~ _ objects where -the dimension of 'depth can be covered with rew adjacently arranged ~ono-~l~ss~a graphic ob~ect ranges.
The drawing shows an embodiment în accordancewith the invention.
Figure 1 illustrates the layer thickness in the case of a zonogram, Figure 2 shows a tomography apparatus in accor~
dance with the invention, for forming zonographic layer images, and Figure 3 shows a tomography apparatus in accor-dance with the invention, which comprises a multiple filmcassette for the simultaneous formation of a plurality of zonographic layer images.
Figure 1 is a sketch illustrating the layer thick-ness relating to a zonogram. The layer thickness S is dependent on the layer angle ~ between two lines a, _ which denote, for example, the central rays of the radiation beam of a displaceable radiation source, and the permissible overall unsharpness U which can be allowed for the relevant field of application. All object details which are present within the shaded zone B during the recording of the zono-gram will be sharply imaged. The sharpness of the image will depend on the total unsharpness U which results from the layer angle ~ and the layer thickness S. All object structures which are situated above and below the shaded zone B will be imaged with a greater degree of unsharpness, in other words in a blurred manner, with the result that artefacts caused by such object structures will be substan-tially reduced.
Figure 2 shows a tomography apparatusin accordance with the invention, for forming zonographic layer images, comprising a source assembly formed by a plurality of radi-ation sources 2 which are distributed in a common radiation source plane 1 according to a predetermined point distribu-tion (see, for example, German Offenlegungsschrift 28 30 186 witha date of Jan. 2~, 1980 and which is assigned to Philips Patentverwaltung GmbH). The number of radiation sources (X-ray tubes) may be, for example, 15 or more, even though for the sake of clarity, Figure 2 shows only three radiation ~ ~ 5~5~
PHD 80020 5 10.10.80 sources. It should be noted that, as an alternative, a single radiation source can be located in succession at the various source positions for irradiating the objec-t.
Underneath -the radiation sources 2, an object 4 is arranged on an examination table 3 and is irra-diated by the distribution of radiation sources 2 so that the corresponding perspective images of the object 4 are in superposition as a source-dis-tribution encoded compo-site image 6 on a record carrier 5, for example, an X-ray film, which is arranged underneath the object 4. The direo- -tion in which the radiation sources 2 irradiate the ob-ject 4 may extend, for example, according -to a line 7 which extends perpendicularly through the zone B of the object L~, the radiation source plane 1 and the flat record carrier 5 also being situated perpendicularly to said line 7. The assembly of radiation sources 2, which are housed, for example, in a common tank in order to form a multiple radiation source, and the record carrier 5, are arranged respectively to be slidable in their relevant plane. In order to form a zonographic image of the object 4 during a radiographic exposure, the radiation sources 2 and the record carrier 5 are displaced, while maintaining their mutual distance, in opposite directions 8, 9 along, for example, their centres respectively straight pa-ths sub-tending the same angle ~ at the object 4 with respect to the first irradiation direction 7, so that the object 4 is irradiated in a further irradiation direction 7l~ the point of intersection of the irradiation directions 7, 7~ -being situated inside the object zone B. Thus, the respec-tive sliding is effectecl so that a respective notional straight line connecting any radiation source to the cen-tre of the record carrier 5 will always pass through a corresponding fixed point (object point) in a common plane (X, Y) through the object 4, for all positions of the radia-tion source assembly relative to the stationary object. In carrying out this, the individual radiation sources 2 at their respec-tive ~ocations in the source as-1 :~5~5~
P~D 80020 6 10.10.80 sembly, are tilted so -that their radiation beams are al-ways directed at the object ~. The radiation sources 2 can be continuowsly activated along their blurring path or can be briefly energized atsuccessive positions therealong.
It will be apparen-t that instead of the sliding of the radiation source group 2 and the record carrier 5, the object 4 and the record carrier 5 can be ~lid in the same direction as described above, parallel to the statio-nary radiation source assembly 2. The individual radiation -10 beams then remain directed on-to the object.
A ~urther possibility of forming zonographic images in a device in accordance with the invention com-prises displacing the radiation source group 2 and the record carrier 5 in their parallel planes along corres-lS ponding circular paths in opposite directions; ~or exam-ple, the line 7 which extends perpendlcularly to the layer plane B would then pass through the centres of said cir-cular paths, the centres of the radiation source assembly
2 and the record carrier 5 respectively subtending the 2n same angle ~ therewith. The displacement must again be such that a respective notional straight line connect-ing any radiation source to the centre of the record car-rier 5 will always pass through the same corresponcling ~ixed point (object point) in a corresponding plane through the object, for all posi-tions of the radiation source group relative to the stationary object. The radia-tion source group 2 is moved along the circular path so that~ in a plan view perpendicularly through the radiation source plane 1, each straigh-t line connecting a respective pair o~ radiation sources, will intersect the coorclinate axes x, y of a flat coorcdinate system, ex-tending parallel to the *adia-tion so~lrce plane and permanently associated with the object 4, always at the same angle. The record carrier 5 is similarly displaced along a corresponding circular path.
Obviously, it is again possible to arrange for the radiation soUrce assembly 2 to be stationary and to displace -the object ~l or the examination table 3 and the 9 ~ ~
PHD 80020 7 10.10.80 record carrier 5 in a similar manner but in the same di-rection along corresponding circular paths. Of course, other curved, flat paths, for example, elliptical paths, can alternatively be followed. The radiation sources can again be continuously activa-ted or be briefly energised at given points along their pathO
Figure 3 shows how three layers B', B, B" of the object 4 which are situated one above -the other can be simultaneously ~onographically recorded by means of a mul-tiple-film cassette 10 in which, for example, three X-ray films 12, 13, 14 are arranged ~ above the o-ther at a distance from each other. The layer B' is recorded on the film 12, the layer B on the film 13 and-the layer B" on the film 14. The images on the X-ray films 12, 13, 14 re-present simultaneous source-distribution encoded images each of which can be employed for the decoding of further layer images which are situated within the respective bo-dy layer regions Bl~ B", B"~, sharply imaged on the cor-responding X-ray film. For -the sake of clarity, Figure 3 shows only one of the sources of the radiation source as-sembly 2.
Obviously, it is again possible to arrange for the radiation soUrce assembly 2 to be stationary and to displace -the object ~l or the examination table 3 and the 9 ~ ~
PHD 80020 7 10.10.80 record carrier 5 in a similar manner but in the same di-rection along corresponding circular paths. Of course, other curved, flat paths, for example, elliptical paths, can alternatively be followed. The radiation sources can again be continuously activa-ted or be briefly energised at given points along their pathO
Figure 3 shows how three layers B', B, B" of the object 4 which are situated one above -the other can be simultaneously ~onographically recorded by means of a mul-tiple-film cassette 10 in which, for example, three X-ray films 12, 13, 14 are arranged ~ above the o-ther at a distance from each other. The layer B' is recorded on the film 12, the layer B on the film 13 and-the layer B" on the film 14. The images on the X-ray films 12, 13, 14 re-present simultaneous source-distribution encoded images each of which can be employed for the decoding of further layer images which are situated within the respective bo-dy layer regions Bl~ B", B"~, sharply imaged on the cor-responding X-ray film. For -the sake of clarity, Figure 3 shows only one of the sources of the radiation source as-sembly 2.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device fox the layer-wise imaging of a three-dimensional object, including radiation source means arranged to irradiate an object under examination with penetrating radiation from each of a plurality of source positions which are distributed in a common radiation source plane, an examination table on which said object is arranged, and a record carrier which is situated under-neath the object to record a source distribution encoded composite image of the object which consists of a corres-ponding plurality of respective perspective images which can overlap one another, characterized in that the radi-ation source means and the record carrier are arranged to slide in opposite directions in mutually parallel planes relative to the stationary object during a radiographic recording so that a respective notional straight line con-necting any said radiation source position to the centre of the record carrier, will pass through a corresponding fixed point in a common plane through the object for all positions of the radiation source means.
2. A device as claimed in Claim 1, characterized in that the radiation source group and the record carrier can be slid along straight paths.
3. A device as claimed in Claim 1, characterized in that the radiation source group and the record carrier are arranged to be slidable along curved, preferably circular paths so that, in a plan view through the radiation source plane, each straight line connecting a respective pair of radiation sources, will intersect the coordinate axes (x, y) of a flat coordinate system, situated parallel to the radiation source plane and permanently associated with the object, always at the same angle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3006828.1 | 1980-02-23 | ||
| DE19803006828 DE3006828A1 (en) | 1980-02-23 | 1980-02-23 | DEVICE FOR GENERATING LAYER IMAGES OF A THREE-DIMENSIONAL OBJECT BY USING OVERLAY ZONOGRAMS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1159580A true CA1159580A (en) | 1983-12-27 |
Family
ID=6095386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000371281A Expired CA1159580A (en) | 1980-02-23 | 1981-02-19 | Device for forming layer images of a three- dimensional object by means of superposition zonograms |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4416018A (en) |
| EP (1) | EP0034862B1 (en) |
| JP (1) | JPS56132330A (en) |
| CA (1) | CA1159580A (en) |
| DE (2) | DE3006828A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208194A (en) * | 1987-05-02 | 1989-03-08 | Rolls Royce Plc | Tomographic imaging |
| JPH06269444A (en) * | 1993-03-24 | 1994-09-27 | Fujitsu Ltd | Method for generating three-dimensional radiograph |
| US6885724B2 (en) * | 2003-08-22 | 2005-04-26 | Ge Medical Systems Global Technology Company, Llc | Radiographic tomosynthesis image acquisition utilizing asymmetric geometry |
| DE102006016572A1 (en) * | 2006-04-06 | 2007-10-18 | Sirona Dental Systems Gmbh | Object`s panoramic tomography creating method, involves reading image information for film with given read frequency from image receiver, where information received from image receiver for film of object is summed in memory area |
| DE102012207567B4 (en) | 2012-05-07 | 2015-02-19 | 4A Engineering Gmbh | Dummy object with extremities, which emulate a natural course of motion by utilizing their inertia |
| DE102016112427B4 (en) | 2016-07-06 | 2019-11-28 | 4Activesystems Gmbh | Powerful and weather-resistant platform for a test system for testing collisions or collision-related situations |
| DE202016008729U1 (en) | 2016-07-06 | 2019-03-27 | 4Activesystems Gmbh | Movable platform with a deformable base for testing collisions or collision-related situations |
| DE102016112518B4 (en) | 2016-07-07 | 2021-03-11 | 4Activesystems Gmbh | Dummy vehicle and method for carrying out tests for a driver assistance system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL292411A (en) * | 1962-05-08 | |||
| FR2004530A1 (en) * | 1968-03-22 | 1969-11-28 | Radiologie Cie Gle | |
| US3818220A (en) * | 1971-11-03 | 1974-06-18 | A Richards | Variable depth laminagraphy |
| DE2414322C3 (en) * | 1974-03-25 | 1980-01-17 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Method and arrangement for decoding overlay images of three-dimensional objects |
| DE2514988C3 (en) * | 1975-04-05 | 1980-03-13 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Method for the layer-by-layer representation of three-dimensional objects by means of coded simultaneous overlay images |
| DE2605497A1 (en) * | 1976-02-12 | 1977-08-18 | Philips Patentverwaltung | METHOD AND DEVICE FOR GENERATING CODED IMAGES WITH A MULTIPLE RADIATION SOURCE |
| DE2810608A1 (en) * | 1978-03-11 | 1979-09-20 | Philips Patentverwaltung | PROCESS FOR LOW-DISTURBANCE LAYER REPRESENTATION OF SPATIAL OBJECTS BY USING DIFFERENT PERSPECTIVE IMAGES |
-
1980
- 1980-02-23 DE DE19803006828 patent/DE3006828A1/en not_active Withdrawn
-
1981
- 1981-02-17 EP EP81200181A patent/EP0034862B1/en not_active Expired
- 1981-02-17 DE DE8181200181T patent/DE3171527D1/en not_active Expired
- 1981-02-19 CA CA000371281A patent/CA1159580A/en not_active Expired
- 1981-02-20 JP JP2319181A patent/JPS56132330A/en active Pending
- 1981-02-23 US US06/237,302 patent/US4416018A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4416018A (en) | 1983-11-15 |
| DE3006828A1 (en) | 1981-09-10 |
| JPS56132330A (en) | 1981-10-16 |
| EP0034862A1 (en) | 1981-09-02 |
| DE3171527D1 (en) | 1985-09-05 |
| EP0034862B1 (en) | 1985-07-31 |
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